Kobbet s



R. S. SHACKFORD.

WRENCH.

APPLICATION FILED MAR. 26. 1920.

1,434,754, I PatenfedNov. 7,1922.

\ max/747R Patented l\lov-- 1 9 i m me;

A N 01m Bonner s. ermane, or BROOK-LINE, Mnssacntisn'rrs. 1

' wanivon.

* A licat onfiied nareh'ee, 1e2o. Serial naeeasseii 7 tion, like reference characters on the draw-- ings indicating likeparts in the severaliigures. I

This invention relates to wrenches and more especially to that type of wrench which is automatically adjustableto the nut or bolt head on which it is working. The invention aims to devise a wrench of this character which shall be simple inconstruction, convenient to operate, and which can be economically manufactured;

Themanner in whichit is'proposed to accomplish these objects will be readily understood from the following description when read in connection with the accompanying drawings, in which- I embodying the present invention; and r i c Figure 2 is a plan view of the head portion ot the wrench shown in Fig. 1,

The construction shown comprises a head consisting of two plates 2 and 3, respectively, properly spaced apart. Integral with this head is a jaw i comprising suitably shaped extensions of the plates 2 and 3 with a spacing block 5' between them, these 7 Secured together by rivets 6. The movable jaw 7 of the-wrench comprises a central plate 8 of the'same 'thiclz ness as the block 5 and twooutside pieces 9 of the same thickness as the plates 2 and .3, the parts 8 and 9 being; secured together by rivets '10. An extension from the central member 8 of the movable jaw is mounted within the head and forms ashank forthe jaw. This shank is slotted, as indicated at 11 and 12, to receive pins 18 and 14 which are secured in'the plates 2 and 3 and cooperate with the slots to guide the movable jaw so that it can slide in a straight linetoward and from the fixed jaw 4. A spring 15 posi tioned in the slot 11 bears at one end against the end of this slot andat'the other end against the pin 13 and'thus tends to hold the movable jaw 7 toward the fixed jaw 4. In other words, this spring tends to close the aws. i T

wrench by a pivot 17 and isprovided -with a cam shaped projection 18 that bears Alhandle l'd-is secured to th oftlle against a cooperating projection 19 on the" shank of the movable jaw. Another projection 20 from this shank engages the side of the camshaped' projection 18 opposite. that engaged by the part 19.

it will now be-clear that when the handle 16 is swung'in a clockwise direction, as the parts appearin 2, the campart 18 act mg on the member 19 will force the movable jaw 7 toward the fixed jaw 5, or, in other words,will close the wrench on the nut or bolt head N on which the wrench is workl l hen the handle 16 is swung in the opposite direction the engagementot the cam-18 with theprojectionQO will open the jaws and thus free the jaws from the nut and enable the wrench tov be turned to obtain anew bite on the nut. Obviously the jaws will be closed up again on to'the nut during the first part of the next clockwise I movement of the handle 16. If the nut or Figure 1 is an isometricview of a wrench.

bolton which the wrench is working is to be backed out or has a left-hand thread t io wrench would simply be turned over before work on the nut or bolt is begun. When the wrench isidle the spring 15 tends to hold the jaws closed and also tends to hold the handle 16 at the lefthand limit of its movement, as

itappe'ars in F lg. 2.

the parts at the head of'the wrench can be stamped or punched of sheet metal, and the handle also can be produced in this way, or if a heavier handle is required it can be cast or made by drop forging. The rivets l3, l4

and 17, in addition to the function above described, also perform the function o fholding,

the plates 2 and 3 in their properly spaced relationship, the outer ends of the rivets for Y this purpose being headed or expanded.

What is claimed as new is: 1. A'wrench of the character described, comprising a hollow head, a jaw rigid with said head, another jaw having a shank pop tion slidable in said head toward and from thefirst jaw, a pin fixed in said head transversely of the sliding movement of said jaw, said shank having a slot therein through which said pin passes, a spring in said slot tending to urge said jaws towardeach other, a handle pivoted in said head, and a cam projection extending therefrom toward said slidable jaw, said slidable jaw having a pro jection engaged by said cam whereby a swinging movement of said handle in one direction ope'rates to force said slidable jaw toward its companion jaw.

2. A wrench of the character described, comprising a hollow head, a jaw rigid with said head, another jaw having a shank portion slidable in said head toward and from the first jaw, said shank having two parallel tively to the first jaw, a handle pivoted in said head and having an extension projecting into a recess formed in said slidable jaw, and a spring acting between said head and slidable jaw to close said aws.

In testimony whereof I havesigned my name to this specification.

ROBERT S. SHACKFORD. 

